JP2005045897A - Rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor which can sufficiently hold a magnet without increasing an air gap between the magnet and a stator even in the case of an increase in size and a high speed rotation of a rotating machine in an inner rotor type rotor. <P>SOLUTION: The rotor 1 of the inner rotor type includes the magnet 5 provided on an outer periphery of a rotor core 3 and covered on at least a part of the outer peripheral surface of the magnet 5 with a magnet cover 6 for preventing the part from being scattered. The magnet 5 is divided into split magnets 5A, 5B in an axial direction of the rotor 1 so that centrifugal forces operating at the split magnets 5A, 5B are reduced and a holding force of the magnet 5 is raised. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inner rotor type rotor used in a rotating machine including an inner rotor and an outer stator.
[0002]
[Prior art]
As a conventional inner rotor type rotor, for example, there are those shown in FIGS. A rotor 101 shown in FIG. 4 includes a rotating shaft 102, a rotor core 103 formed by laminating a large number of circular steel plates in the axial direction, and two end plates 104 provided on both sides of the rotor core 103 in the axial direction. And a plurality of magnets 105 provided on the outer periphery of the rotor core 103 at regular intervals, and a ring-shaped magnet cover 106 that covers the outer peripheral surface of each magnet 105 and prevents the magnet 105 from scattering.
[0003]
In the rotor 101, a magnet 105 is bonded to the outer periphery of the rotor core 103, a magnet cover 106 is attached to the outer periphery of the magnet 105, and the rotor core 103 and the end plate 104 are fixed to each other by bolts 107 and nuts 108. The both ends of the magnet cover 106 are held by the end plates 104 on both sides, and constitute a rotating machine together with the stator 110 located on the outer peripheral side.
[0004]
A rotor 201 shown in FIG. 5 includes a rotating shaft 102, a rotor core 103, and a magnet 105, and two end plates provided on both sides in the axial direction of the rotor core 103, similarly to the rotor. The magnet cover 206 is used. The magnet cover 206 includes a substrate portion 206a corresponding to an end plate, and a hook-shaped suppression portion 206b formed at the outer peripheral end of the substrate portion 206a. The suppression portion 206b is provided at both end portions in the axial direction of the outer peripheral surface of the magnet 105. The magnet 105 is held by locking (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 63-110944 [0006]
[Problems to be solved by the invention]
By the way, in the inner rotor type rotor described above, it is preferable in terms of performance to make the air gap between the magnet and the stator (reference numeral G in FIGS. 4 and 5) as small as possible, and the small air gap is maintained. In order to prevent contact between the magnet and the stator, it is necessary to secure the magnet holding state. Further, when the rotating machine is increased in size and rotation, the centrifugal force acting on the magnet is increased, so that the magnet needs to be held more strongly.
[0007]
Therefore, in the past, it was considered to use a thick and high-strength magnet cover as a means to hold the magnet more powerfully. However, if the magnet cover is thick, it is naturally fixed to the magnet. Since there is a problem that the air gap between the children also increases, thereby reducing the performance of the rotating machine, it has been desired to solve such a problem.
[0008]
OBJECT OF THE INVENTION
The present invention has been made by paying attention to the above-mentioned conventional problems, and in an inner rotor type rotor, the air gap between the magnet and the stator is increased even when the rotating machine is increased in size and speed. It aims at providing the rotor which can fully hold | maintain a magnet, without making it.
[0009]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a rotor of an inner rotor type in which a magnet is provided on the outer periphery of the rotor core and at least a part of the outer peripheral surface of the magnet is covered with a magnet cover for preventing scattering. The rotor iron core is divided in the axial direction of the rotor corresponding to the divided magnets, and the magnet covers are arranged on both sides in the axial direction of the divided iron cores. A board part corresponding to the surface and a restraining part corresponding to at least both axial ends of the outer peripheral surface of each divided magnet are provided, and the divided iron cores are fixed to each other together with the magnet cover. As a means to do.
[0010]
【The invention's effect】
According to the rotor of claim 1 of the present invention, the centrifugal force acting on each divided magnet is separated from the centrifugal force acting on the conventional magnet by dividing the magnet provided on the outer periphery of the rotor core in the axial direction. Therefore, if the size and speed of the rotating machine is the same as the conventional machine, the magnet cover can be thinned and the magnet can be held sufficiently. As a result, the air gap between the magnet and the stator can be reduced to achieve improved performance of the rotating machine. In addition, when increasing the size of the rotating machine or increasing the rotation speed, a magnet cover with a wall thickness equal to or less than that of the conventional one can be used without increasing the air gap between the magnet and the stator. The magnet can be sufficiently held, thereby improving the reliability at high rotation. Furthermore, by improving the holding power of the magnet, it becomes possible to eliminate the need for adhesion of the magnet to the rotor iron core, which can contribute to improvement in assembly workability and cost reduction of the rotating machine.
[0011]
According to the rotor of claim 2 of the present invention, the same effect as that of claim 1 can be obtained, and each divided magnet can be held more firmly with a simple structure.
[0012]
【Example】
An inner rotor type rotor 1 shown in FIGS. 1 and 2 is provided on a rotary shaft 2, a rotor core 3 formed by laminating a large number of circular steel plates in the axial direction, and surfaces on both sides of the rotor core 3 in the axial direction. Two end plates 4, a plurality of magnets 5 provided on the outer periphery of the rotor core 3 at regular intervals, and a ring-shaped magnet cover 6 that covers the outer peripheral surface of each magnet 5 and prevents the magnets 5 from scattering. The magnet 5 is divided in the axial direction of the rotor 1. The magnet 5 in this embodiment is divided into two divided magnets 5A and 5B having the same size.
[0013]
The rotor 1 is provided with a magnet 5 composed of two divided magnets 5A and 5B on the outer periphery of the rotor iron core 3, and at this time, the divided magnets 5A and 5B are bonded to the rotor iron core 3 as necessary. A magnet cover 6 is attached to the outer periphery of the rotor, and the rotor core 3 and the end plate 4 are fixed to each other at several points on the circumference by bolts 7 and nuts 8. keeping.
[0014]
Further, on the outer peripheral side of the rotor 1, a stator 11 in which a plurality of coils 13 are arranged at regular intervals on an annular stator core 12 is provided, and the rotor 1 and the stator 11 constitute a rotating machine. is doing.
[0015]
In the rotor 1 described above, the magnet 5 provided on the outer periphery of the rotor core 3 is divided into two divided magnets 5A and 5B, so that, for example, the size and rotational speed of the rotor are the same as the conventional one shown in FIG. When they are equal, the centrifugal force acting on each of the divided magnets 5A and 5B is halved with respect to the centrifugal force acting on the conventional magnet (105).
[0016]
Therefore, in the rotor 1, the thickness of the magnet cover 6 is clearly smaller than that of the conventional magnet cover (106) shown in FIG. However, a sufficient holding force against the centrifugal force during rotation can be exhibited. Moreover, in the said rotor 1, the air gap G between the magnet 5 and the stator 11 is also set small with the thinning of the magnet cover 6, Thereby, the performance improvement of a rotary machine can be implement | achieved. Become.
[0017]
Further, in the above embodiment, the case where the magnet cover 6 is thinned to reduce the air gap G is exemplified. However, when the rotating machine is to be increased in size or increased in rotation, the wall thickness equivalent to the conventional one or The magnet cover 6 having the following thickness can be used to sufficiently hold the magnet 5 without increasing the air gap G between the magnet 5 and the stator 11, thereby ensuring reliability at high rotation. Improvements can be realized.
[0018]
FIG. 3 is a diagram for explaining another embodiment of the rotor of the present invention. The illustrated rotating machine 21 includes a magnet 5 including a rotating shaft 2, a rotor core 3, and two divided magnets 5A and 5B, and corresponds to each of the divided magnets 5A and 5B, as in the rotor of the previous embodiment. Thus, the rotor core 3 is divided in the axial direction of the rotor 1. That is, the rotor core 3 is divided into two divided cores 3A and 3B.
[0019]
In this embodiment, magnet covers 26 are provided on both sides in the axial direction of the divided cores 3A and 3B. The magnet cover 26 includes a substrate portion corresponding to the end plate of the previous embodiment, that is, the substrate portions 26a corresponding to the surfaces on both sides in the axial direction of the divided cores 3A and 3B, and the axial direction of the outer peripheral surfaces of the divided magnets 5A and 5B. Suppressing portions 26b corresponding to both end portions are provided. At this time, the restraining portion 26b is formed in a state where the outer peripheral end of the substrate portion 26a is bent substantially at a right angle.
[0020]
The rotor 21 fixes the divided iron cores 3A and 3B together with the four magnet covers 26 with bolts 7 and nuts 8. In each divided iron core 3A and 3B, each of the divided magnets 5A and 5B is fixed. The divided magnets 5A and 5B are held by holding the restraining portions 26b of the magnet covers 26 on both sides in the axial direction both ends.
[0021]
In the rotor 21, the centrifugal force acting on each of the divided magnets 5A and 5B is reduced as in the previous embodiment, so that the entire magnet cover 6 is thinner than the conventional rotor shown in FIG. As a result, the air gap G between the magnet 5 and the stator 11 can be set small to improve the performance of the rotating machine, and the divided magnets 5A and 5B can be made more simple with a simple structure. It can hold firmly.
[0022]
Further, even in the rotor 21 of the above embodiment, when the rotating machine is to be increased in size or increased in rotation, a magnet cover 26 having a wall thickness equivalent to or smaller than that of the conventional magnet cover 26 is used. The magnet 5 can be sufficiently held without increasing the air gap G between the stator 5 and the stator 11.
[0023]
The details of the structure of the rotor of the present invention are not limited to the above embodiments, and the number of divisions of the magnet and the rotor core can be other than two. 3, the rotor core 3 is divided, so that two adjacent magnet covers 26 can be integrated, or two magnet covers 26 sandwiching the divided cores 3A and 3B can be integrated. It is also possible to integrate the magnet cover 26.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view with one side omitted for explaining an embodiment of a rotor of the present invention.
FIG. 2 is a front view of the rotor and stator shown in FIG. 1 with one side omitted.
FIG. 3 is a cross-sectional view with one side omitted for explaining another embodiment of the rotor of the present invention.
FIG. 4 is a cross-sectional view with one side omitted illustrating a conventional rotor.
FIG. 5 is a cross-sectional view with one side omitted to explain another example of a conventional rotor.
[Explanation of symbols]
1,21 Rotor 3 Rotor cores 3A, 3B Split core 5 Magnets 5A, 5B Split magnets 6, 26 Magnet cover 26a Substrate part 26b Suppressing part

Claims (2)

A rotor of an inner rotor type in which a magnet is provided on the outer periphery of the rotor core and at least a part of the outer peripheral surface of the magnet is covered with a magnet cover for preventing scattering, and the magnet is divided in the axial direction of the rotor. Features a rotor. The rotor iron core is divided in the axial direction of the rotor corresponding to the divided magnets, and the magnet cover has at least the axial direction of the substrate portions corresponding to the surfaces on both sides in the axial direction of the divided iron cores and the outer peripheral surface of each divided magnet. 2. The rotor according to claim 1, further comprising a restraining portion corresponding to each end portion, wherein each of the divided iron cores is fixed to each other together with the magnet cover.

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